Recording stylus



April 14, 1931. L F CARTER 1,800,198

RECORDING STYLUS Filed F'eb. 16, 1927 INVENTOR Patented Apr. 14, 1931 UNITED STATES PATENT OFFICE LESLIE F. CARTER, OF LFDNIA, NEW JERSEY, ASSIGNOR, BY' HERNE ASSIGNMENTS, TO SPERRY PRODUCTS, INC., F BROOKLYN, NEW YORK, CORPORATION 0F NEW YORK RECORDING STYLUS Application led February 18, 1927. Serial No. 168,515.

This invention relates to a new type of recording stylus and more particularly to the class of metal Styli which are employed most usually in connection with metallic recording paper, that is, recording paper having a metallized surface. The type of stylus heretofore employed for such recording has been a metal rod turned down to a point at its recording end. The use of such a `stylus had m many serious disadvantages, among which were, first, that the point soon wore off and there was left a flat end which made a much thicker recording line after a certain amount of use than at the beginning; second, the

stylus very frequently was bent to such degree yas to render it inoperative; third, the stiff projecting stylus frequently cut into the record chart and tore and wrinkled the same so as to mar the record completely. These are among the many disadvantages which are connected with the use of the ordinary stylus heretofore employed, especially in connection with metallized paper. l

It is one object of my inventionto provide a metal stylus which will always make a record line of uniformA thickness, which can'- not possibly become bent in use, and which cannot catch in the paper to wrinkle, tear or otherwise obstruct the movement of the recording sheet.

Other objects and advantages of the invention will become apparent in the following detailed description thereof.

In the accompanying drawings,

Fig. 1 is a front elevation showing one application of my stylus to a record instrument.

Fig. 2 is a vertical section through one of my invention.

Fig. 5 isa vertical section through still another form of stylus embodying the principles of my inventlon; y

`served that the form of stylus'that I have here illustrated, while capable of general use is especially adapted for use in connection with a traveling record sheet 10, whichin 'this case is designed to have recorded thereon the course of a vessel as determined by the course recorder 11, said chart traveling beneath one or more pens 12 adapted to mark a permanent record thereon. Preferably' the record sheet is a metallized record sheet, that is, has a coating of some metal or metaloxiie and is adapted to be marked by a metal sty us. l l

In Figs. 2 and 3 I'have shown in detail one form of stylus embodying the principles of my invention and said principles may be stated as follows:

First, instead of employing a free, unsupported .metal marker I employ a marker 15 which is, however, completely surrounded, with the exception of a small projecting tip, by a holder 16. The marker 15 is, of course, of lsuch material as willproduce a mark on the metallized paper, this material being usually brass, while the support 16 is of nonc marking material, such as iron or steel. I. may provide the marker with the necessary reslliency in any suitable manner, as by making it of sprin material with a bend, such as 17, therein. n either case the marker is of such length that when there is no tension thereon the point will roj ect a short distance beyond the face 18 o the support 16 when not in engagement withthe record sheet. en, however, the support 16 engages the recordsheet, the ressure will be suiiicient tov cause the ti o marker 15 to lie substantially flush wit the face 18. There is, therefore, no possibility of the marker becoming bent in service, nor can said marker engage in and catch any wrinkle in the surface o the paper to tear or otherwise obstruct the passage of the record sheet. I cause the face 18 to extend radiall from the marker a distance at least three t1me`s the amount that said tscribed. lWhere the marker 1s a single unlt 1t marker projects `beyond said face when not in engagement with the recordusheet, so that if the support 16 is rolled out of the vertical position there will be no danger of bending the A 5 marker tip. If desired I may form the face may be a piece of spring wire as-shown with one or more bends therein to permit compressionl of the spring wire when in engagement with the record sheet, said wire extending 'through a central opening 21 through the support to theface 18. The upper end of the marker may be held in a split cap 22 adaptedl to fitl in a bore 23 in the upper end of the sup port 16. For locking the cap 22 within said bore the upper end of support 16 may be w formed with a wedge-shaped top24 upon which is adapted to lit a screw cap -25 having ga lcam-shaped inner bore 26 for receiving 25 said wedge lportion' r24. It will become at once apparent that upon screwing cap 25 downwardly the end 24 will be clamped more and more tightly 'against the split cap 22 to cause said cap to grip the end of the marker firmly.

The principles of my invention may be embodied. in a plurality of forms, several of which are disclosed in the remaining Figs. 4 to 7 of the drawings, Thus in Fig. 4 there is a marker 15 of the same material as marker 15, within a support 16', said support carrying a projection 3() extending from one side thereof to provide the necessary initial bend Ain marker 15 to allow said marker-to be compressed when in engagement with the record paper. The upper end of marker 15 in this instance may extend through the censomewhat similar to that of F ig.l 4 except that the initial bend in marker 15 is produced by leading said marker throughtwo openings 341-35 in one side wallof the casing 16. In this case the upper end of marker 15 may be held ina Vblock 40 in the same manner as said marker is held in cap 25 in Fig. 4' and the thumb screw 32 mayl extend through the wall of casing 16 directly into said block 40.

. 'In .accordance with the provisions of the lpatent statutes, I have herein described lthe principle and operation of my invention, to-

' gether with the apparatus which I now con-f 1165. Sider to represent the beStembQdment yyond said face when out of contact with saidA ichart, .said marker having a bend therein to' Figs. 5 and 6 disclose another modification tacones out interfering with, the more general results outlined, and the invention extends to such use.

Having described my invention, what I claim and desire to4 secure by Letters Patent is l. A stylus for a recording chart of metallized paper and-the like, comprising a holder of non-marking material having a face adapted to engage said ch'art,v a resilient marker supported vin said holder and normally 'projecting a predetermined distance bepermit compression whereby it is substantially flush with said face when in contact with the chart.

2. A stylus fora recording chart of metallized paper and the like, comprising a holder of non-marking material, a thin wire metal marker supported in said holder and normally projecting beyond said holder, said marker being of uniform thickness throughout its length, means for anchoring said marker in said holder adjacent the inner endA thereof, the bore of said holder being enlarged between the ends of the marker to permit flexure thereof. i

3. A stylus for a recording chart of metall i lized paper and the like, comprising a holder of non-marking material, and a thin wire metal marker supported in said holder so that the end thereof projects beyond said 105 holder, said marker being of uniform thickness throughout its length and having a bend therein to permit compression.

In' testimony whereof I have aiixed my signature.

LESLIE F. CARTER. 

